Most chocks I have seen are about a 6x6 cut on a 45 degrees, some with a radii on the hypotenuse. The whole point is to use the vehicle weight climbing a steep hill to prevent movement. Walmart chocks seem to fit everything from 6.00-6 aircraft tires to 22" dualies, but I wouldn't use them on the dualies since they would probably collapse from the weight. Add a bungie system to keep them tight against the tires and it aint going anywhere but needs tiedowns just because.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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